scholarly journals Neutral-current background induced by atmospheric neutrinos at large liquid-scintillator detectors. I. Model predictions

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Jie Cheng ◽  
Yu-Feng Li ◽  
Liang-Jian Wen ◽  
Shun Zhou
Keyword(s):  
Liquid Scintillator ◽  
Neutral Current ◽  
Atmospheric Neutrinos ◽  
Model Predictions ◽  
Scintillator Detectors

scholarly journals Neutrinos: Detection and Interpretation

1989 ◽  
Vol 8 ◽  
pp. 229-237
Author(s):  
L.N. Alexeyeva
Keyword(s):  
Liquid Scintillator ◽  
Theoretical Description ◽  
Time Profile ◽  
Individual Characteristics ◽  
Angular Distributions ◽  
Supernova 1987A ◽  
The Galaxy ◽  
Supernova Explosions ◽  
Scintillator Detectors ◽  
Water Cherenkov Detectors

AbstractObservations of the neutrino burst from Supernova 1987A by water Cherenkov detectors (KAMIOKANDE II, IMB) and liquid scintillator detectors (Baksan, Mont Blanc) are reviewed. It is shown that neutrino signal from SN 1987A was observed. There are 24 events in three detectors (KAMIOKANDE II, IMB, Baksan) recorded at 7:35 UT. The average properties of the signal (effective neutrino temperature, total energy of neutrino emission, burst duration) are consistent with the general theoretical description of supernova explosions. Special attention is concentrated on individual characteristics of the signals detected and the available discrepancies of the model estimates. Time profile of the neutrino burst, estimates of effective neutrino temperatures and total neutrino energies, angular distributions of the events are discussed. These properties point out, probably, a more compound picture of the phenomenon. The more detail analysis of the experimental data is needed and all possibilities must be at least considered. Based upon the Baksan observations, an upper limit of 0.35 core collapse in the Galaxy per year (90% C.L.) is shown.

Characterizations of BC501A and BC537 liquid scintillator detectors

2015 ◽  
Vol 104 ◽  
pp. 15-24 ◽  
Author(s):  
Jianguo Qin ◽  
Caifeng Lai ◽  
Bangjiao Ye ◽  
Rong Liu ◽  
Xinwei Zhang ◽  
...  
Keyword(s):  
Liquid Scintillator ◽  
Scintillator Detectors

scholarly journals CNNs for enhanced background discrimination in DSNB searches in large-scale water-Gd detectors

2021 ◽  
Vol 2021 (11) ◽  
pp. 051
Author(s):  
D. Maksimović ◽  
M. Nieslony ◽  
M. Wurm
Keyword(s):  
Large Scale ◽  
Neutral Current ◽  
Direct Analysis ◽  
Atmospheric Neutrinos ◽  
Observation Window ◽  
Novel Method ◽  
Supernova Neutrino ◽  
Large Water ◽  
Water Cherenkov Detectors

Abstract Gadolinium-loading of large water Cherenkov detectors is a prime method for the detection of the Diffuse Supernova Neutrino Background (DSNB). While the enhanced neutron tagging capability greatly reduces single-event backgrounds, correlated events mimicking the IBD coincidence signature remain a potentially harmful background. Neutral-Current (NC) interactions of atmospheric neutrinos potentially dominate the DSNB signal especially in the low-energy range of the observation window that reaches from about 12 to 30 MeV. The present paper investigates a novel method for the discrimination of this background. Convolutional Neural Networks (CNNs) offer the possibility for a direct analysis and classification of the PMT hit patterns of the prompt events. Based on the events generated in a simplified SuperKamiokande-like detector setup, we find that a trained CNN can maintain a signal efficiency of 96% while reducing the residual NC background to 2% of the original rate. Comparing to recent predictions of the DSNB signal and measurements of the NC background levels in Super-Kamiokande, the corresponding signal-to-background ratio is about 4:1, providing excellent conditions for a DSNB discovery.

scholarly journals Unambiguously Resolving the Potential Neutrino Magnetic Moment Signal at Large Liquid Scintillator Detectors

2021 ◽  
Vol 38 (11) ◽  
pp. 111401
Author(s):  
Ziping Ye ◽  
Feiyang Zhang ◽  
Donglian Xu ◽  
Jianglai Liu
Keyword(s):  
Magnetic Moment ◽  
Liquid Scintillator ◽  
Solar Neutrinos ◽  
Electromagnetic Properties ◽  
Beyond The Standard Model ◽  
Fundamental Physics ◽  
Neutrino Magnetic Moment ◽  
Solar Axion ◽  
Moment Interaction ◽  
Scintillator Detectors

Non-vanishing electromagnetic properties of neutrinos have been predicted by many theories beyond the Standard Model, and an enhanced neutrino magnetic moment can have profound implications for fundamental physics. The XENON1T experiment recently detected an excess of electron recoil events in the 1–7 keV energy range, which can be compatible with solar neutrino magnetic moment interaction at a most probable value of μν = 2.1 × 10−11 μ B. However, tritium backgrounds or solar axion interaction in this energy window are equally plausible causes. Upcoming multi-tonne noble liquid detectors will test these scenarios more in depth, but will continue to face similar ambiguity. We report a unique capability of future large liquid scintillator detectors to help resolve the potential neutrino magnetic moment scenario. With O(100) kton⋅year exposure of liquid scintillator to solar neutrinos, a sensitivity of μν < 10−11 μ B can be reached at an energy threshold greater than 40 keV, where no tritium or solar axion events but only neutrino magnetic moment signal is still present.

scholarly journals Scintillation balloon for neutrinoless double-beta decay search with liquid scintillator detectors

2019 ◽  
Vol 2019 (7) ◽  
Author(s):  
S Obara ◽  
Y Gando ◽  
K Ishidoshiro
Keyword(s):  
Beta Decay ◽  
Liquid Scintillator ◽  
Rare Decay ◽  
Feasibility Studies ◽  
Neutrinoless Double Beta Decay ◽  
Environmental Radioactivity ◽  
Double Beta Decay ◽  
Sequential Decay ◽  
Antineutrino Detector ◽  
Scintillator Detectors

Abstract Environmental radioactivity is a dominant background for rare decay search experiments, and it is difficult to completely remove such an impurity from detector vessels. We propose a scintillation balloon as the active vessel of a liquid scintillator in order to identify this undesirable radioactivity. According to our feasibility studies, the scintillation balloon enables the bismuth–polonium sequential decay to be tagged with a 99.7% efficiency, assuming a KamLAND-type (KamLAND = Kamioka Liquid scintillator AntiNeutrino Detector) liquid scintillator detector. This tagging of sequential decay using alpha rays from the polonium improves the sensitivity to neutrinoless double-beta decay while rejecting beta ray background from the bismuth.

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